Device of human conveyance

ABSTRACT

An application for a device for human conveyance includes a front wheel and a rear wheel. The rear wheel interfaced to a sprocket through a ratchet drive system which allows forward rotation of the rear wheel in response to forward rotation of the sprocket and allows free backward rotation of the sprocket. A frame interfaces the front wheel to the rear wheel keeping the front wheel at a constant distance from the rear wheel. The front and rear wheels are rotatably interfaced to the frame. A front end of an arc-shaped spring is affixed to the frame in proximity to the front wheel and a rear end of the arc-shaped spring has a sprocket gear interfaced to the sprocket whereas depression of the arc-shaped spring pushes the rear-end of the arc-shaped spring in a rearward direction with respect to the rear wheel and the sprocket gear turns the sprocket in a forward rotational direction.

CROSS-REFERENCE TO RELATED APPLICATION

This nonprovisional patent application claims priority to U.S. provisional application Ser. No. 60/918,058; filed Mar. 15, 2007, the disclosure of which is hereby incorporated by reference.

FIELD OF THE INVENTION

This invention relates to a method and apparatus for allowing a person operating the device of human conveyance to propel oneself, via the device, in a controlled manner along a navigable path.

BACKGROUND OF THE INVENTION

When a person jumps in the air using muscle energy a substantial amount of potential energy has been created. An example would be appreciated by watching as the person springs and bounce higher and higher on a diving board. Similarly, a human can simply lift one foot off the ground, while maintaining support with the other foot. Thereafter, with gravity alone or with a slight amount of additional downward muscle force, the human may allow the elevated foot's weight to descend and create a comparable effect.

Humanly created potential energy is available to be converted into a substantial amount of useful kinetic energy through little additional effort, by only relying on the natural laws of gravity.

Prior devices for human conveyance relied upon this kinetic energy to be directed onto a pedal system as in a bicycle or pushed against the ground as with a scooter or skateboard. Being that it is not practical to integrate a pedal system in a scooter or a skate board because of the low clearance of the running board of such devices, a way to propel such a device using the energy of a human user is needed. A system is needed that utilizes this energy, providing useful conveyance of the human user.

SUMMARY OF THE INVENTION

In one embodiment, a device for human conveyance is disclosed including a front wheel, a rear wheel and a frame which interfaces the front wheel to the rear wheel whereas the front wheel is held at a constant distance from the rear wheel. The front wheel and the rear wheel are rotatably interfaced to the frame. A device is provided for creating a rearward movement from a downward movement and another device is provided for converting the rearward movement into a rotational movement of the rear wheel.

In another embodiment, a device for human conveyance is disclosed including a front wheel and a rear wheel. The rear wheel interfaced to a sprocket through a ratchet drive system which allows forward rotation of the rear wheel in response to forward rotation of the sprocket and allows free backward rotation of the sprocket. A frame interfaces the front wheel to the rear wheel keeping the front wheel at a constant distance from the rear wheel. The front and rear wheels are rotatably interfaced to the frame. A front end of an arc-shaped spring is affixed to the frame in proximity to the front wheel and a rear end of the arc-shaped spring has a sprocket gear interfaced to the sprocket whereas depression of the arc-shaped spring pushes the rear-end of the arc-shaped spring in a rearward direction with respect to the rear wheel and the sprocket gear turns the sprocket in a forward rotational direction.

In another embodiment, a method of human conveyance is disclosed including providing a device for human conveyance that has a front wheel and a rear wheel. The rear wheel is interfaced to a sprocket through a ratchet drive system and the ratchet drive system allows forward rotation of the rear wheel in response to forward rotation of the sprocket and free backward rotation of the sprocket. A frame interfaces the front wheel to the rear wheel keeping the front wheel at a constant distance from the rear wheel. The front wheel and the rear wheel are rotatably interfaced to the frame. A front end of an arc-shaped spring is affixed to the frame in proximity to the front wheel while a rear end of the arc-shaped spring has a sprocket gear interfaced to the sprocket. Depressing the arc-shaped spring pushes the rear-end of the arc-shaped spring in a rearward direction with respect to the rear wheel resulting in the sprocket gear turning the sprocket in a forward rotational direction. The method continues with a user pushing down on the arc-shaped spring causing the rear end of the arc-shaped spring to turn the sprocket and, therefore, turning the rear wheel causing the device for human conveyance to move in a forward direction. Next, the user lifts up on the arc-shaped spring, thereby returning the rear end of the arc-shaped spring. The prior two steps are repeated until the device for human conveyance reaches a point of destination.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention can be best understood by those having ordinary skill in the art by reference to the following detailed description when considered in conjunction with the accompanying drawings in which:

FIG. 1 illustrates an operational schematic view of the present invention.

FIG. 2 illustrates a second operational schematic view of the present invention.

FIG. 3 illustrates a third operational schematic view of the present invention.

FIG. 4 illustrates a fourth operational schematic view of the present invention.

FIG. 5 illustrates an isometric view of the present invention.

FIG. 6 illustrates a plan view of the present invention showing the drive spring in its relaxed mode and depressed mode.

FIG. 7 illustrates a plan view of the present invention showing an alternative drive mechanism.

FIG. 8 illustrates an enlarged plan view of a first gear system of the present invention.

FIG. 9 illustrates an enlarged plan view of a second gear system of the present invention.

FIG. 10 illustrates an enlarged plan view of a spool system of the present invention.

FIG. 11 illustrates an enlarged plan view of a third gear system of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Reference will now be made in detail to the presently preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Throughout the following detailed description, the same reference numerals refer to the same elements in all figures.

Referring to FIGS. 1 and 2, an operational schematic view of a system of the present invention is shown. The present invention translates simple body motions 15 into a useful force that may then be used to efficiently rotate a wheel. The present invention is directed to a vehicle composed of a semi flexible or rigid chassis supported by one or more wheels placed in both the forward and rear of the vehicle. Outwardly, an embodiment of a configuration of this invention could be described as resembling a bicycle, a scooter, or even a skateboard.

An embodiment of the present invention is directed to a means of propulsion of the inventive device. The present invention provides a flexible or hinged platform which securely attaches to a chassis at one end and converts a human's self-generated up and down energy into a rotational energy, which can efficiently rotate a wheel of the device.

A unidirectional drive mechanism is activated by either a flexible or hinged platform that maintains an angled configuration while at rest. The platform assumes a more linear profile as it is deformed or flattened by the rider's weight.

In FIG. 1, the sides 20/30 of the triangle 10 are shown with equivalent lengths as the hypotenuse 50. It should be noted that the hypotenuse 50 of the triangle virtually exists in an embodiment of the present invention. Changes in dimension between a first vertex 35 and a second vertex 45 occur as a result of a force 15 applied to the third vertex 25. The change in dimension is represented by a distance 50 between the first vertex 35 and the second vertex 45. Since the sides 20/30 of the triangle are of fixed length, as pressure 15 is applied to the third vertex 25, the sides 20/30 are flattened as shown in FIG. 2. The result in the downward force 15 is transposed into a linear force making the distance 50 between the first and second vertices 35/45 approach the total of the length of the sides 20/30. In operation, a spring (not shown) is positioned to pull the first and second vertices 35/45 together, thereby returning the triangle 10 to its original shape after the force 15 is diminished. It should also be noted that a stop is needed, preventing the sides 20/30 from becoming a straight line; is such was allowed, the spring is prevented from returning the triangle 10 to its original shape.

Referring to FIGS. 3 and 4, an operational schematic view of a system of the present invention is shown. The present invention translates simple body motions 15 into a useful force that may then be used to efficiently rotate a wheel.

In FIG. 3, an arc 22/32 is shown. In this example, each half of the arc 22/32 is shown of equal size and shape, although this is not required. The distance 52 between the end points of the arc 38/48 is shown. Changes in dimension between end points 38/48 of the arc 22/32 occur as a result of a force 15 applied to the arc 22/32. The change in dimension is represented by a distance 52 between end points 38/48 of the arc 22/32. Since the halves 22/32 of the arc are of fixed length, as pressure 15 is applied to the arc 22/32, the side halves 22/32 of the arc 22/32 are flattened as shown in FIG. 4. The result in the downward force 15 is transposed into a linear force making the distance 50 between the end points 38/48 of the arc 22/32 become longer.

Referring to FIG. 5, an isometric view of the present invention is shown. Although the device for human conveyance 110 is shown as a scooter, the present invention includes any device for human conveyance, including a scooter, a skateboard, etc. Also, although shown having two front wheels 112 and one back wheel 130, any configuration of wheels is anticipated, including one front wheel and one back wheel.

In some embodiments, the scooter 110 has handle bars 116 interfaced with the front wheels 112 for steering the scooter. In some embodiments, a foot rest 114 is provided to allow the user to rest a foot upon while using the other foot for propelling the device for human conveyance 110 as will be discussed.

The front wheel(s) 112 are coupled to the rear wheel(s) 130 by a frame member 122. The frame member 122 keeps the front wheel(s) 112 at a constant distance from the rear wheel(s) 130. In the preferred embodiment, the frame member 122 is semi-rigid, providing some flexibility to absorb the shock of the propulsion mechanism. In other words, the frame 122 bends slightly, preferably at a mid-section, when downward pressure is applied. In some embodiments, the frame member 122 is rigid.

In the example of FIG. 5, the rear wheel 130 is rotatably attached to the frame member 122 by a frame member plate 126. In some embodiments, a rear wheel guard 132 is provided to reduce the risk of a user rubbing their shoe against the rear wheel(s) 130 while using the scooter 110.

In this example, the drive mechanism consists of an arc-shaped drive spring 120 that has a rear-wheel interface 124. The rear wheel interface 124 will be described later. The drive mechanism operates based upon the principles previously described, in that, when the user presses down on the drive spring 120, the rear wheel interface is pushed in a generally horizontal rearward direction, thereby interfacing with the rear wheel 130 (as will be described), causing the scooter 110 to move in a forward direction. In its simplest form, the interface to the rear wheel 130 is a friction interface, in that the rear-wheel interface 124 rubs against a hub (not shown), causing the hub to turn the rear wheel 130 in a forward direction. So that the rear wheel 130 does not stop or reverse when the rear-wheel interface 124 retracts (e.g., the use lifts up), a ratchet mechanism as known in the industry is provided to allow the rear wheel to continue to turn in a forward direction while the rear-wheel interface 124 retracts.

Referring to FIG. 6, a plan view of the present invention showing the drive spring in its relaxed mode and depressed mode is shown. Again, a device for human conveyance 110 is shown as a scooter with a front wheel 112 and a rear wheel 130.

In this example, the scooter 110 has handle bars 116 interfaced with the front wheels 112 for steering the scooter. In some embodiments, a foot rest 114 is provided to allow the user to rest a foot upon while using the other foot for propelling the device for human conveyance 110 as will be discussed.

The front wheel(s) 112 are coupled to the rear wheel(s) 130 by a frame member 122. The frame member 122 keeps the front wheel(s) 112 at a constant distance from the rear wheel(s) 130. In this embodiment, the rear wheel 130 is rotatably attached to the frame member 122 by a frame member plate 126. In some embodiments, a rear wheel guard 132 is provided to reduce the risk of a user rubbing their shoe against the rear wheel(s) 130 while using the scooter 110. In the preferred embodiment, the frame member 122 is semi-rigid, providing some flexibility to absorb the shock of the propulsion mechanism. In other embodiments, the frame member 122 is rigid.

The drive mechanism arc-shaped drive spring 120 is shown in its relaxed position (e.g., the user has not applied pressure with a foot) and in its compressed position (shown in dashed lines). As can be seen, the tail end of the drive spring 124 extends rearward past the rear wheel drive mechanism as the drive spring 120 is compressed.

Referring to FIG. 7, a plan view of the present invention showing an alternative drive mechanism is shown. Again, a device for human conveyance 210 is shown as a scooter with a front wheel 112 and a rear wheel 130.

In some embodiments, the scooter 210 has handle bars 116 interfaced with the front wheels 112 for steering the scooter. In some embodiments, a foot rest 114 is provided to allow the user to rest a foot upon while using the other foot for propelling the device for human conveyance 210 as will be discussed.

The front wheel(s) 112 are coupled to the rear wheel(s) 130 by a frame member 122. The frame member 122 keeps the front wheel(s) 112 at a constant distance from the rear wheel(s) 130. In this embodiment, the rear wheel 130 is rotatably attached to the frame member 122 by a frame member plate 126. In some embodiments, a rear wheel guard 132 is provided to reduce the risk of a user rubbing their shoe against the rear wheel(s) 130 while using the scooter 210.

In this embodiment, the drive mechanism angle-shaped drive 152/154 is shown in its relaxed position (e.g., the user has not applied pressure with a foot) As can be seen, the tail end 164 of the angle-shaped drive 152/154 will extend rearward past the rear wheel drive mechanism as the angle-shaped drive 152/154 is compressed (e.g., by a user's foot). To return the angle-shaped drive 152/154 to its original position after the user lifts their foot, a spring 156 is employed. Other spring configurations are anticipated as known in the art. In some embodiments, a foot platform 150 is attached to the angle-shaped drive 152/154, providing greater comfort to the user's foot as the user steps down on the angle-shaped drive 152/154.

Referring to FIG. 8, an enlarged plan view of a first gear system of the present invention is shown. In this example, the tail end 124 of the arc-shaped drive spring 120 is shown interfacing with a multiple-speed sprocket system 140 interfaced to the rear wheel 130 by a drive shaft 131. As the tail end 124 of the arc-shaped drive spring 120 moves in the rearward direction, it turns a selected one of the sprockets 140. If the smaller sprocket of the sprockets 140 is selected, the scooter will go faster whereas if a larger sprocket of the sprockets 140 is selected, the scooter will go slower but will be able to climb a steeper grade as known in the industry. The sprockets 140 are interfaced to the rear wheel 130 by a ratchet mechanism (not shown internal to the hub of the wheel 130) as known in the industry, providing forward motion as the tail end 124 of the arc-shaped drive spring 120 moves in a rearward direction with respect to the rear wheel and allows the wheel 130 to roll freely in the forward motion as the tail end 124 of the arc-shaped drive spring 120 moves in a forward direction with respect to the rear wheel 130.

Referring to FIG. 9, an enlarged plan view of a second gear system of the present invention is shown. In this example, the tail end 124 of the arc-shaped drive spring 120 is shown interfacing with a single sprocket 142 interfaced to the rear wheel 130 by a drive shaft 131. As the tail end 124 of the arc-shaped drive spring 120 moves in the rearward direction with respect to the rear wheel 130, it turns the sprocket 142. The sprocket 142 is interfaced to the rear wheel 130 by a ratchet mechanism (not shown) as known in the industry, providing forward motion as the tail end 124 of the arc-shaped drive spring 120 moves in a rearward direction with respect to the rear wheel and allows the wheel 130 to roll freely in the forward motion as the tail end 124 of the arc-shaped drive spring 120 moves in a forward direction with respect to the rear wheel 130.

Referring to FIG. 10, an enlarged plan view of a spool system of the present invention is shown. In this embodiment, the tail end 124 of the arc-shaped drive spring 120 is interfaced to a spool 170/172 by a cable 174. In this example, the spool shares a hub 131 of the rear wheel 130.

The cable 174 is attached to the tail end 124 of the arc-shaped drive spring 120 at an end 176. As the tail end 124 of the arc-shaped drive spring 120 moves in the rearward direction with respect to the rear wheel 130, it pulls the cable 174 which is wound around the spool 170/172. This unwinding operation causes the rear wheel 130 to turn in a forward direction. The spool 170/172 is interfaced to the rear wheel 130 by a ratchet mechanism (not shown) as known in the industry, providing forward motion as the tail end 124 of the arc-shaped drive spring 120 moves in a rearward direction with respect to the rear wheel and allows the wheel 130 to roll freely in the forward motion as the tail end 124 of the arc-shaped drive spring 120 moves in a forward direction with respect to the rear wheel 130. Additionally, the spool 170/172 is spring-loaded to rewind the cable 174 around the spool 170/172 as the tail end 124 of the arc-shaped drive spring 120 moves in the forward direction.

Referring to FIG. 11, an enlarged plan view of the gear system of the present invention is shown. In this example, a sprocket interface gear 180 is affixed to the tail end 124 of the arc-shaped drive spring 120. The teeth of the sprocket 142 mesh with the sprocket interface gear 180 so that as the tail end 124 of the arc-shaped drive spring 120 and sprocket interface gear 180 move in the rearward direction with respect to the rear wheel 130, the sprocket 142 turns the wheel 130 in a forward direction. The sprocket 142 is interfaced to the rear wheel 130 by a ratchet mechanism (not shown) as known in the industry, providing forward motion as the tail end 124 of the arc-shaped drive spring 120 moves in a rearward direction with respect to the rear wheel and allows the wheel 130 to roll freely in the forward motion as the tail end 124 of the arc-shaped drive spring 120 moves in a forward direction with respect to the rear wheel 130.

Note that a sprocket interface 180/142 is described as an example and any other type of gear interface known in the industry is anticipated and is interchangeable with the described sprocket 142—sprocket interface gear 180 system.

Equivalent elements can be substituted for the ones set forth above such that they perform in substantially the same manner in substantially the same way for achieving substantially the same result.

It is believed that the system and method of the present invention and many of its attendant advantages will be understood by the foregoing description. It is also believed that it will be apparent that various changes may be made in the form, construction and arrangement of the components thereof without departing from the scope and spirit of the invention or without sacrificing all of its material advantages. The form herein before described being merely exemplary and explanatory embodiment thereof. It is the intention of the following claims to encompass and include such changes. 

1. A device for human conveyance comprising: a front wheel; a rear wheel; a frame member interfacing the front wheel to the rear wheel whereas the front wheel is held at a constant distance from the rear wheel and whereas the front wheel and the rear wheel are rotatably interfaced to the frame member; a means for creating a rearward movement from a downward movement; and a means for converting the rearward movement into a rotational movement of the rear wheel; wherein means for creating a rearward movement comprises an arc-shaped spring, the front of the arc-shaped spring held stationary with respect to the frame member, whereas the downward movement depresses the arc-shaped spring, thereby pushing a rear end of the arc-shaped spring in a rearward direction with respect to the rear wheel.
 2. The device for human conveyance of claim 1, wherein the rear end of the arc-shaped spring is interfaced to turn the rear wheel through a sprocket system and a ratchet system.
 3. The device for human conveyance of claim 2, wherein the sprocket system has multiple, selectable sprockets.
 4. The device for human conveyance of claim 1, wherein the rear end of the arc-shaped spring is interfaced to turn the rear wheel through a spool and cable system and a ratchet system.
 5. The device for human conveyance of claim 1, wherein means for creating a rearward movement comprises an angled-shaped drive having a spring affixed to each side of the angle-shaped drive, the front of the angled-shaped drive held stationary with respect to the frame member, whereas the downward movement depresses the angled-shaped drive, thereby pushing a rear end of the angled-shaped drive in a rearward direction with respect to the rear wheel.
 6. The device for human conveyance of claim 5, wherein the rear end of the angled-shaped drive is interfaced to turn the rear wheel through a sprocket system and a ratchet system.
 7. The device for human conveyance of claim 6, wherein the sprocket system has multiple, selectable sprocket gears.
 8. The device for human conveyance of claim 5, wherein the rear end of the angle-shaped drive is interfaced to turn the rear wheel through a spool and cable system and, in turn through a ratchet system.
 9. The device for human conveyance of claim 1, wherein the frame member is semi-rigid.
 10. A device for human conveyance comprising: a front wheel; a rear wheel, the rear wheel interfaced to a sprocket through a ratchet drive system, the ratchet drive system allowing forward rotation of the rear wheel in response to forward rotation of the sprocket and the ratchet drive system allowing free backward rotation of the sprocket; a frame interfacing the front wheel to the rear wheel whereas the front wheel is held at a constant distance from the rear wheel and whereas the front wheel and the rear wheel are rotatably interfaced to the frame; an arc-shaped spring, a front end of the arc-shaped spring affixed to the frame in proximity to the front wheel, a rear end of the arc-shaped spring having a sprocket gear interfaced to the sprocket whereas depression of the arc-shaped spring pushes the rear-end of the arc-shaped spring in a rearward direction with respect to the rear wheel and the sprocket gear turns the sprocket in a forward rotational direction.
 11. The device for human conveyance of claim 10, wherein the device for human conveyance is a scooter.
 12. The device for human conveyance of claim 11, further comprising a handle system interfaced with the front wheel for steering the device for human conveyance.
 13. The device for human conveyance of claim 12, further comprising a foot rest interfaced with the handle system for placing of a user's foot.
 14. The device for human conveyance of claim 10, wherein the frame is semi-rigid.
 15. A method of human conveyance, the method comprising: (a) providing a device for human conveyance, the device for human conveyance comprising: a front wheel; a rear wheel, the rear wheel interfaced to a sprocket through a ratchet drive system, the ratchet drive system allowing forward rotation of the rear wheel in response to forward rotation of the sprocket and the ratchet drive system allowing free backward rotation of the sprocket; a frame interfacing the front wheel to the rear wheel whereas the front wheel is held at a constant distance from the rear wheel and whereas the front wheel and the rear wheel are rotatably interfaced to the frame; an arc-shaped spring, a front end of the arc-shaped spring affixed to the frame in proximity to the front wheel, a rear end of the arc-shaped spring having a sprocket gear interfaced to the sprocket whereas depression of the arc-shaped spring pushes the rear-end of the arc-shaped spring in a rearward direction with respect to the rear wheel and the sprocket gear turns the sprocket in a forward rotational direction; (b) pushing down on the arc-shaped spring, thereby causing the rear end of the arc-shaped spring to turn the sprocket and therefore the sprocket turns the rear wheel causing the device for human conveyance to move in a forward direction; (c) lifting up on the arc-shaped spring, thereby returning the rear end of the arc-shaped spring; and (d) repeating steps b and c until the device for human conveyance reaches a point of destination.
 16. The method of claim 15, wherein the device for human conveyance is a scooter.
 17. The method of claim 16, further comprising a handle system interfaced with the front wheel and steering the device for human conveyance using the handle system.
 18. The method of claim 17, further comprising a foot rest interfaced with the handle system and placing a user's foot.
 19. The method of claim 15, wherein the frame is semi-rigid. 